A pressure-induced electronic transition in the kagome magnetic superconductor CeRu<sub>2</sub>

ORAL

Abstract

It was predicted by I. M. Lifshitz in 1960 [1] that an unusual isomorphic "electronic transition" of 2 and 1/2 order associated with a topological change of the Fermi surface of a metal can be induced by pressure or doping. Such a Fermi surface topological transition can lead to subtle changes in the electronic energy spectra, resulting in anomalies in the properties of solids such as the superconducting transition temperature, the symmetry of the superconducting order parameter, the thermal electric power, etc., as summarized recently [2]. We have investigated the transport, magnetic, and structural properties of the kagome magnetic superconductor CeRu2 under pressures up to ~168 GPa and found an unusual isomorphic electronic transition at ~ 28 GPa as evidenced by the sudden change in the sign of dTc/dP from negative to positive. In addition, a few other structural transitions were also revealed. The results will be presented and their implications discussed.

References: [1] I. M. Lifshitz, JETP 33, 1569 (1960); [2] A. A. Varlamov et al., Low Temp. Phys. 47, 672 (2021)

*This work is supported in part by US AFOSR; TLL Temple Foundation; JJ&R Moores Endowment; State of Texas through TCSUH; National Research Foundation, Singapore; Nanyang Technological University; Ministry of Education, Singapore; US National Science Foundation; and US Department of Energy.

–

Publication: Magnetic Kagome Superconductor CeRu2, L. Z. Deng et al., arXiv:2204.00553v2 [cond-mat.supr-con]. https://doi.org/10.48550/arXiv.2204.00553

Presenters

  • Ching-Wu W Chu

    • University of Houston
    • Department of Physics and Texas Center for Superconductivity, University of Houston

Authors

  • Ching-Wu W Chu

    • University of Houston
    • Department of Physics and Texas Center for Superconductivity, University of Houston

  • Liangzi Deng

    • University of Houston
    • Department of Physics and Texas Center for Superconductivity, University of Houston

  • Melissa J Gooch

    • University of Houston

  • Hongxiong Liu

    • Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics, Chinese Academy of Sciences, Beijing, China
    • Chinese Academy of Sciences

  • Trevor Bontke

    • University of Houston

  • Sen Shao

    • Nanyang Technological University

  • NILESH P SALKE

    • University of Illinois Chicago

  • Daniel Schulze

    • University of Houston

  • Jingyang You

    • National University of Singapore

  • Ravhi Kumar

    • University of Illinois at Chicago
    • University of Illinois Chicago
    • Department of Physics, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607
    • University of Illinois, Chicago
    • Department of Physics, University of Illinois at Chicago

  • Yuan P Feng

    • National University of Singapore
    • Natl Univ of Singapore

  • Guoqing Chang

    • Nanyang Technological University
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore

  • Jia-Xin Yin

    • 2Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA
    • Princeton University

  • Youguo Shi

    • Beijing National Laboratory for Condensed Matter Physics
    • Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics, Chinese Academy of Sciences, Beijing, China
    • Chinese Academy of Sciences

  • Russell J Hemley

    • University of Illinois at Chicago
    • University of Illinois Chicago
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago
    • Department of Physics and Chemistry, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois at Chicago

  • Qimiao Si

    • Rice University